JPS592032Y2 - Double stack detection device for paper sheet conveyance equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention is intended to prevent the incorrect use of a paper sheet conveying device in which sheets are inserted in duplicate.

When new paper sheets are used in a paper sheet conveying device, it often happens that two overlapping sheets are mistakenly inserted as one sheet.

In particular, when a banknote is placed on a conveyance device such as a banknote identification device and the authenticity is determined based on the amount of transmitted light by irradiating light while the banknote is being transported, the amount of light transmitted from a stack of two new banknotes and the amount of light transmitted from a single old banknote are determined. The amount of transmitted light is approximately the same, causing the inconvenience of accepting two new banknotes.

In view of the above points, the present invention provides a device that can reliably detect double sheet insertion in a sheet conveying device.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the device of the present invention, in which paper sheets inserted through an insertion port 4 are placed on a belt 3 stretched between pulleys 1 and 2 and conveyed in the direction of the arrow.

The roller 5 disposed on the side of the insertion port 4 is supported by a solid shaft 9 at one end of the locking tool 6, and is urged to press the belt 3 from above by a spring 10 attached to the other end.

Therefore, the inserted paper sheets are transferred to the belt 3 and the roller 5.
It is held and transported by the

A detector 11 disposed in the insertion slot 4 outputs a detection signal when detecting the insertion of paper sheets, rotates the pulleys 1 and 2, and drives the belt 3, and is composed of, for example, a photocoupler.

The first detection device 7 sequentially generates a pulse train when detecting rotation of the roller 5.

That is, when the first detection device 7 is configured with a magnetic detector by embedding the magnetic body 12 in a part of the rotating surface of the roller 5, the intermittent approach of the magnetic body 12 as the roller 5 rotates causes the first
The detection device 7 generates a pulse train.

Similarly, when the pulley 1 rotates, the second detection device 8, which is a magnetic detector, is activated by the magnetic material 13 embedded in the surface of the pulley 1.
produces a sequential pulse train.

The counter 18 counts the pulse train from the first detection device 7, and when a predetermined count value is reached, it outputs a roller rotation signal as if the roller 5 has rotated.
is configured to count the pulse train from the second detection device 8 and, when a predetermined count value is reached, output a pulley rotation signal indicating that the pulley 1 has rotated.

In an actual device, if three pulses are counted using a ternary counter (that is, if the magnetic material passes through the sensing area of the magnetic detector three times), it is assumed that the pulley 1 or roller 5 is rotating. A pulley rotation signal or roller rotation signal is output.

Further, although the rotation detection method described above is based on magnetic detection, there is also a method based on light.

Figure 2 is a circuit that determines double insertion, and AND gate 1.
The output of the roller rotation signal inverted by the inverter 15 and the pulley rotation signal are input to A 4.
The output of the ND gate 14 is a double stack insertion signal.

Two new sheets of paper 16 are placed in the device of the present invention having the above configuration.
．． The operation when 17 are inserted overlappingly will be explained.

The belt 3 is driven by the detection of insertion by the detector 11, but the paper sheet 17 on the lower side that is in contact with the belt 3 remains on the belt 3.
However, since the upper paper sheet 16 in contact with the roller 5 has less friction with the paper sheet 17, it is stopped on the spot without being transported.

In this case, the roller 5 may be rotated due to the stoppage of the paper sheet 16. Since the detection device 7 is not generating a pulse train, the counter 18 is not outputting a roller rotation signal. A double sheet insertion signal is obtained by the AND gate 14 using the boolean rotation signal outputted from the counter 19 by the pulse train generated by the second detection device 8, and this signal is displayed to the user by lighting a lamp or the like. Do the following.

Furthermore, when a single sheet is inserted, this sheet is conveyed while being held between the belt 3 and the roller 5, so the roller 5 can also rotate, and the AND gate 14 outputs a double sheet insertion signal. Not done.

The present invention described in detail above is characterized in that paper sheets are conveyed by a belt placed on the lower side, and urged from above by a roller that rotates as the paper sheets move.

Conventional paper sheet conveying devices have a pair of upper and lower belts stretched over a set of pulleys, and the paper sheets are held and conveyed by both belts. Therefore, when paper sheets are inserted overlapped, they are separated from each other. Both sheets were received at the same time because they were conveyed by the belts that were in contact with each other.

However, in the present invention, the roller that is biased from above is
Since it does not contribute to conveyance, it has the effect of separating overlapping paper sheets, and furthermore, by detecting rotation/non-rotation of the roller, it is possible to electrically obtain a double sheet insertion signal, making subsequent countermeasures easier. This provides the following advantages.

[Brief explanation of the drawing]

FIG. 1 shows the device of the present invention, and FIG. 2 shows a circuit for obtaining a double-sheet insertion signal. Explanation of main drawing numbers 1, 2...Pulley, 3...
...Belt, 4...Insertion slot, 5...
・Roller, 6...Biasing device, 7...
First detection device, 8...Second detection device.

Claims (1)

[Scope of utility model registration request] A device for transporting paper sheets by placing them on a belt stretched over a set of pulleys, and a roller disposed on the paper sheet insertion opening side of the device to sandwich the paper sheets together with the belt. a biasing device for causing the roller to press the belt; a first detection device for detecting rotation of the roller; a second detection device for detecting rotation of the pulley; means for outputting a roller rotation signal when the detection device detects a predetermined rotation of the roller; means for outputting a pulley rotation signal when the second detection device detects a predetermined rotation of the pulley; A double sheet insertion detection device for a sheet conveying device, comprising means for outputting a double sheet insertion signal in a state in which the roller rotation signal is not output at the time of output.